127198091 has 4 divisors (see below), whose sum is σ = 127280832. Its totient is φ = 127115352.

The previous prime is 127198079. The next prime is 127198129. The reversal of 127198091 is 190891721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 127198091 - 2¹⁰ = 127197067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127198991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39020 + ... + 42153.

It is an arithmetic number, because the mean of its divisors is an integer number (31820208).

Almost surely, 2^127198091 is an apocalyptic number.

127198091 is a deficient number, since it is larger than the sum of its proper divisors (82741).

127198091 is an equidigital number, since it uses as much as digits as its factorization.

127198091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82740.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 127198091 is about 11278.2131120138. The cubic root of 127198091 is about 502.9137748480.

The spelling of 127198091 in words is "one hundred twenty-seven million, one hundred ninety-eight thousand, ninety-one".